Delta VFD2A7ME43ANNAA - Page 367

Chapter 14 Fault Codes and DescriptionsME300
14-4
Reset method Manual reset
Reset condition Reset in 5 sec. after the fault is cleared.
Record Yes
Cause Corrective Actions
Malfunction caused by interference
Verify the wiring of the control circuit and wiring/grounding of the main circuit to
prevent interference.
Hardware failure
Check if other error codes such as cd1–cd3 occur after cycling the power. If yes,
return to the factory for repair.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
7
Over-voltage during
acceleration
(ovA)
DC BUS over-voltage during acceleration. When ovA
occurs, the drive closes the gate of the output, the
motor runs freely, and the display shows an ovA error.
Action and Reset
Action level
230V series: 410 V
DC
460V series: 820 V
DC
Action time Immediately act when DC BUS voltage is higher than the level.
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset only when DC BUS voltage is lower than 90% of the over-voltage level.
Record Yes
Cause Corrective Actions
Acceleration is too slow (e.g. when
lifting load decreases acceleration
time)
Decrease the acceleration time.
Use brake unit or DC BUS.
Replace the drive with a larger capacity model.
The setting for stall prevention
level is smaller than no-load
current.
The setting for stall prevention level should be larger than no-load current.
Power voltage is too high.
Check if the input voltage is within the rated AC motor drive input voltage range,
and check for possible voltage spikes.
ON/OFF switch action of phase-in
capacitor in the same power
system
If the phase-in capacitor or active power supply unit acts in the same power
system, the input voltage may surge abnormally in a short time. In this case,
install an AC reactor.
Regenerative voltage of motor
inertia
Use over-voltage stall prevention function (Pr.06-01)
Use auto-acceleration and auto-deceleration setting (Pr.01-44)
Use a brake unit or DC BUS
Acceleration time is too short.
Check if the over-voltage warning occurs after acceleration stops.
When the warning occurs, do the following:
1. Increase the acceleration time
2. Set Pr.06-01 over-voltage stall prevention
3. Increase the setting value for Pr.01-25 S-curve acceleration arrival time 2
Motor ground fault
The ground short circuit current charges the capacitor in the main circuit through
the power. Check if there is ground fault on the motor cable, wiring box and its
internal terminals.
Troubleshoot the ground fault.
Incorrect wiring of brake resistor or
brake unit
Check the wiring of brake resistor or brake unit.
Malfunction caused by interference
Verify the wiring of the control circuit and wiring/grounding of the main circuit to
prevent interference.
ID No. Display on LCM Keypad Fault Name Fault Descriptions
8
Over-voltage during
deceleration
(ovd)
DC BUS over-voltage during deceleration. When ovd
occurs, the drive closes the gate of the output, the
motor runs freely, and the display shows an ovd error.
Action and Reset
Action level
230V series: 410 V
DC
460V series: 820 V
DC
Action time Immediately act when DC BUS voltage is higher than the level.
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset only when DC BUS voltage is lower than 90% of the over-voltage level.
Record Yes